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B
Reduce carbon dioxide
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C
Reduce alcohol
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D
Oxidise alcohol
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Solution
The correct option is B Reduce carbon dioxide Methanogens are microorganisms that produce methane in absence of oxygen by the process called as methanogenesis. They belong to the kingdom Monera and the domain archaea. They use inorganic material as the source of energy such as hydrogen sulfide, elemental sulfur, ferrous iron, ammonia. They reduce carbon dioxide to methane and use hydrogen gas as an electron-donating reductant.
Thus, the correct answer is 'Reduce carbon dioxide.'